Naisho no Half Moon(1984)

Naisho no Half Moon

Yu Enoki has dreams of becoming a famous actress, following the footsteps of her infamous older step brother, Shinichi Serizawa. No one knows about their family connection...

She secretly applies to become an actress of a movie, only to realize much later when she gets through the auditions, that she would be playing the love interest of her older step brother, and that they would have to kiss!